There is pretty much always one game I will buy a system for. Of course I buy more games for it once I have the system and will probably spend more time with other games than the one I bought the system for. But even combined those games was not enough for me to spend money on the system.
The exception being PS5, I bought it mostly to have a 4K Blu-ray player and to play last generation games since I skipped out on a PS4 or XBOX one. But I did not have any particular game in mind.